Ansible v2 compatibility

[ageis]

@conorsch R

[conorsch]

@ageis Hey, this is great. I have some complementary changes locally, I'll rebase on top of yours.

[conorsch]

Two updates:

• convert all instances of sudo to become (even in example playbooks)
• require at least v1.9 of ansible, since that's the version that deprecated sudo

[conorsch]

We may have to check ansible_version on tasks using the regex_replace filter and escape the backreferences accordingly. From the docs:

Prior to ansible 2.0, if “regex_replace” filter was used with variables inside YAML arguments (as opposed to simpler ‘key=value’ arguments), then you needed to escape backreferences (e.g. \1) with 4 backslashes (\) instead of 2 ().

Will need to do further testing, but I'm pretty sure we have to only one of the escaping styles. If we want to support v1.9, we can use a version check. After more testing to confirm the behavior I'll open a separate issue if it's a problem.